How many businesses do you visit every day? Every week? Every month?
I have a report that I hand out to all of the businesses that I meet with on a regular basis. This includes restaurants, dry cleaner, etc. I have a box of these reports in my car. They are in a report cover (kind of like the ones used for book reports in school, but they're a little more professional) that cost me about a dollar a piece.
The report used to be called "Eight Ways to Get More Customers." I have since changed the title. It is now called, "Crush Your Competition - How Your Business Can Thrive, Even in a Rough Economy." (The second title is getting a higher callback rate.)
In the report I give eight ways for businesses to use various Internet marketing techniques and social media in order to get more customers. I don't give any kind of a sales pitch with it. I simply give a big smile and hand it to the manager or owner of the business (and I know who that is because it is a business that I go to on a regular basis) and tell them that I thought they might like to have it.
I often have people call me back, but if I don't hear from them I simply follow up the next time I normally go to the business.
If you wanted to do something like this, my suggestion would be to make a list of five or more services that you offer and make a guide for business owners with your contact information in the back and start handing out these guides businesses that you normally visit.
Just another way to get some irons in the fire.
edited to add: The term "accidental selling" refers to sales that you don't purposely set out to make, but that happen as a natural course of your daily activities.